SW3231004_Supplement-EZ Form_20240405

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1 Project Name Banoak Elementary School
2 Project Area(ac) 8.69
3 Coastal Wetland Area(ac) 0
4 Surface Water Area(ac) 0
5 Is this project High or Low Density? High
6 Does this project use an off-site SCM? No
OOMPLlANGI WItR t(2H MOO"
7 Width of vegetated setbacks provided(feet) 30
8 •Will the vegetated setback remain vegetated? Yes
9 If BUA is proposed in the setback,does it meet NCAC 02H.1003(4)(c-d)? N/A
10 Is streambank stabilization proposed on this project? No
NUMBER AND TYPE OF SCMs:
11 Infiltration System
12 Bioretention Cell
13 Wet Pond
14 Stormwater Wetland
15 Permeable Pavement
16 Sand Filter
17 Rainwater Harvesting(RWH)
18 Green Roof
19 Level Spreader-Filter Strip(LS-FS)
20 Disconnected Impervious Surface(DIS)
21 Treatment Swale
22 Dry Pond _
23 StormFilter
24 Silva Cell
25 Bayfilter 1
26 Filterra
FORMS LOADED
DESIGNER CERTIFICATION _
27 Name and Title: Miles A.Wright, PE,PLS
28 Organization: Wright&Associates
29 Street address: 209 1st Ave South
30 City,State,Zip: Conover,NC 28613
31 Phone number(s): 828-465-2205
32 Email: [e-mail]
Certification Statement:
I certify,under penalty of law that this Supplement-EZ form and all supporting information were prepared under my direction or supervision;that the
information provided in the form is,to the best of my knowledge and belief,true,accurate,and complete;and that the engineering plans,
specifications,operation and maintenance agreements and other supporting information are consistent with the information provided here.
Designer
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DRAINAGE AREAS
' 1 Is this a high density project? Yes
2 If so,number of drainage areas/SCMs 1
3 Does this project have low density areas? No
4 If so,number of low density drainage areas 0
. Is all/part of this project subject to previous rule
• 5 versions? No
FORMS LOADED
DRAINAGE AREA INFORMATION Entire Site 1
4 Type of SCM Bayfilter
5 Total drainage area(sq ft) 378318 184258
6 Onsite drainage area(sq ft) k 378318 184258
7 Offsite drainage area(sq ft) 0 0
8 Total BUA in project(sq ft) 175272 sf 169537 sf _
New BUA on subdivided lots(subject to permitting)
9 (sq ft) sf sf
New BUA not on subdivided lots(subject to
10 permitting)(sf) 140569 sf 134834 sf
11 Offsite BUA(sq ft) sf sf
12 Breakdown of new BUA not on subdivided lots:
-Parking(sq ft) 117302 sf 111567 sf
-Sidewalk(sq ft) 14494 sf 14494 sf
-Roof(sq ft) 8773 sf 8773 sf
-Roadway(sq ft)
-Future(sq ft) _(_
-Other,please specify in the comment box
below(sq ft)
New infiltrating permeable pavement on
13 subdivided lots(sq ft)
New infiltrating permeable pavement not on
14 subdivided lots(sq ft)
Existing BUA that will remain(not subject to
15 permitting)(sq ft) 34703 sf 34703 sf
16 Existing BUA that is already permitted(sq ft)
17 Existing BUA that will be removed(sq ft) 67359 sf 67359 sf
18 Percent BUA 10% 18%
19 Design storm(inches) 1.0 in
20 Design volume of SCM(cu ft) 4678 cf
21 Calculation method for design volume 1"Volume
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
22 drainage area(s):
We are treating 1.2 Acres of New Impervious Area

BAYFILTER
I Drainage area number 1
2 Minimum required treatment volume(Cu ft) 3509 cf
GENERAL MDC FROMD2H Soso
3 Is the SCM sized to treat the SW from all surfaces at build-out? Yes
4 Is the SCM located away from contaminated soils? Yes
5 What are the side slopes of the SCM(H:V)? N/A
6 Does the SCM have retaining walls,gabion walls or other engineered N/A
side slopes?
Are the inlets,outlets,and receiving stream protected from erosion
7 Yes
(10-year storm)?
8 Is there an overflow or bypass for inflow volume in excess of the Yes
design volume?
9 What is the method for dewatering the SCM for maintenance? Pump(preferred)
10 If applicable,will the SCM be cleaned out after construction? N/A
11 Does the maintenance access comply with General MDC(8)? Yes
12 Does the drainage easement comply with General MDC(9)? Yes
13 If the SCM is on a single family lot,does(will?)the plat comply with Yes
General MDC(10)?
14 Is there an O&M Agreement that complies with General MDC(11)? Yes
15 Is there an O&M Plan that complies with General MDC(12)? Yes
16 Does the SCM follow the device specific MDC? Yes
17 Was the SCM designed by an NC licensed professional? Yes
BAYFILTER MDC FROM THE STORM WATER DESIGN MANUAL
18 If Volume Design is used,what is the volume from the drainage area 3509 cf
(cubic feet)?
19 Is an upstream detention used? Yes
20 Volume of the upslope detention system(cubic feet) 4678 cf
21 Percent of the design volume contained in the upslope detention 133%
system(%)
22 If Rate Based Sizing is used,for 1 inch or 1.5 inch(Coastal areas).
Water Quality flow rate for drainage area(cfs)
23 Number of cartridges 5
24 Cartridge height(inches) 20 in
25 SHWT elevation(fmsl)
26 Elevation of bottom of BayFilter vault(fmsl) 1202.83
27 Clearance from the SHWT(feet)
28 BayFilter Media Flow Rate(GPM/ft2 of Media Surface) 1 gpm/sf
29 Does the system includes a sediment sump? Yes
30 If yes,the diameter of the sump(feet) 5 ft
31 If yes,the depth of the sump(feet) 2 ft
32 Time to drain the sump(hours) 1 hrs
33 Time to drain the BayFilter(hours) 4 hrs
34 Is an off-line flow splitting device used? Yes
° 35 Type of media used(EMC or GAC-metals) GAC-Metals
36 Will maintenance be performed by Certified Maintenance Providers Yes
per instructions?
ADDITIONAL INFORMATION
37 Please use this space to provide any additional information about the
BayFilter system(s):
Line#28 Bayfilter Media Flow Rate is 0.50 gpm/sf; Line
29-32:Sump is provided in the inlet manhole at the isolator row.